This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A304008 #4 May 04 2018 11:21:23 %S A304008 1,49,53,115,271,538,1458,2973,7826,19113,47074,115148,283156,698411, %T A304008 1720946,4258788,10518418,26019796,64391560,159345205,394533973, %U A304008 976872015,2419079852,5991435758,14839400772,36760610050,91064615465 %N A304008 Number of nX6 0..1 arrays with every element unequal to 0, 2, 3 or 5 king-move adjacent elements, with upper left element zero. %C A304008 Column 6 of A304010. %H A304008 R. H. Hardin, <a href="/A304008/b304008.txt">Table of n, a(n) for n = 1..210</a> %e A304008 Some solutions for n=5 %e A304008 ..0..1..0..0..0..1. .0..1..1..1..0..1. .0..1..0..1..0..1. .0..0..0..0..1..0 %e A304008 ..1..1..1..0..1..0. .1..0..0..1..0..0. .0..1..1..1..0..0. .1..1..0..1..1..0 %e A304008 ..0..1..1..1..1..0. .1..1..0..0..1..1. .0..0..1..1..1..0. .1..0..1..0..0..1 %e A304008 ..0..0..1..1..0..0. .0..0..1..0..0..1. .0..1..1..0..1..0. .0..0..1..0..1..1 %e A304008 ..1..0..1..1..0..1. .1..0..1..1..1..0. .1..0..0..0..0..1. .1..0..1..1..0..0 %Y A304008 Cf. A304010. %K A304008 nonn %O A304008 1,2 %A A304008 _R. H. Hardin_, May 04 2018